form {
    margin: auto;
    border: 1px solid black;
    text-align: center;
}

fieldset {
    border: 1px solid green;
    margin: auto;
}

legend {
    font-weight: bold;
}

.tab_form {
    margin: auto;
}

.erreur {
    font-style: italic;
    color : red;
}



